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Summary of Significant Accounting Policies - Narrative (Details) |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jul. 15, 2020 USD ($) | Jul. 31, 2020 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2021 USD ($) consumer retirement_plan | Dec. 31, 2020 USD ($) | Jan. 01, 2021 USD ($) | Apr. 30, 2019
Product Information [Line Items] |  |  |  |  |  |  |
Operating lease, liability |  |  |  | $ 1,546,000 |  | $ 2,101,000 |
Right-of-use asset |  |  |  | 1,260,000 | $ 0 | 2,101,000 |
Deferred rent |  |  |  | $ 0 | 180,000 |  |
Number of customers per impressions | consumer |  |  |  | 1,000 |  |  |
Cash equivalents |  |  |  | $ 0 | 0 |  |
Restricted cash |  |  |  | 0 | 91,000 |  |
Purchase of digital currencies |  |  |  | 41,284,000 | 0 |  |
Proceeds from receipt of digital assets |  |  |  | 680,000 |  |  |
Impairment of digital currencies |  |  |  | 9,383,000 | 0 |  |
Purchase of other digital currencies |  |  |  | 287,000 |  |  |
Impairment of other digital currencies |  |  |  | $ 159,000 |  |  |
Number of employee retirement plans | retirement_plan |  |  |  | 1 |  |  |
Employer matching contributions made to retirement plan |  |  |  | $ 0 | $ 0 |  |
Digital Assets |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |
Aggregate cost basis of digital currency holdings |  |  |  | $ 41,964,000 |  |  |
Accounting Standards Update 2016-02 |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |
Operating lease, liability |  |  |  |  |  | 2,101,000 |
Right-of-use asset |  |  |  |  |  | 2,101,000 |
Short-term deferred rent |  |  |  |  |  | 8,000 |
Deferred rent |  |  |  |  |  | $ 180,000 |
Senior Convertible Note |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |
Interest rate of notes (as a percent) |  |  | 7.00% |  |  |  |
Principal amount of note |  |  | $ 3,000,000 |  |  |  |
Proceeds from debt, net of issuance costs |  |  | 2,371,000 |  |  |  |
Proceeds from issuance of debt |  |  | $ 2,760,000 |  |  |  |
Convertible notes |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |
Interest rate of notes (as a percent) | 7.00% |  |  |  |  |  | 7.00%
Proceeds from issuance of debt | $ 1,751,000 | $ 1,751,000 |  |  |  |  |
Convertible notes | Series A Note |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |
Principal amount of note | $ 4,320,000 | $ 4,320,000 |  |  |  |  |
Minimum |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |
Term of license subscription agreement (in months) |  |  |  | 1 year |  |  |
Maximum |  |  |  |  |  |  |
Product Information [Line Items] |  |  |  |  |  |  |
Term of license subscription agreement (in months) |  |  |  | 3 years |  |  |

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